Question

Gabriela is a soil scientist trying to discover why the trees in a forest are failing to thrive. She takes a soil sample that includes several horizons of soil. Which horizon would Gabriela expect to find in her sample that wouldn't be present in all types of

soil?
B
E
A
O

Answer 1

E.

Step-by-step explanation:

Soil horizons are distinct layers of soil that have different physical, chemical and biological properties due to the processes of soil formation. The main soil horizons are O, A, E, B, C and R, but some of them may be absent in certain soils. The E horizon is a layer of soil that has lost clay, iron and organic matter due to the downward movement of water from the upper layers. It is usually pale-colored and located between the A and B horizons. The E horizon does not occur in all soil types, because it needs specific conditions for its development, such as acidic parent material, high precipitation and plant cover. Therefore, the answer is: E.